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I am a domestic coffee machine engineer based in Glasgow, Scotland and i service, repair and refurbish these machines on a daily basis. You will probably find that the gaskets which are holding the sightglass in place are completely solid and resemble a hard plastic like gasket. There will definately be gaskets there as if not the sightglass would rattle about and the water would pour straight out. It depends on which sight glass nuts you have but if they are the clear plastic nuts you will find either black, white or clear gaskets underneath and if the nuts are metal then you should see brass washers first and then the gaskets underneath the washers. These are easily replaced and can be purchased from our website www.theespressoshop.co.uk I hope this helps and if you have any further questions or queries then please do not hesitate to get in touch at email@example.com
If the machine works great after the first cup then it is possible that the heat for your first espresso went to heating the portafilter or the cup used to brew into, try warming the portafilter first by running some hot water through it first.
I supply all La Pavoni spare parts and dispatch all over the world. Go to www.theespressoshop.co.uk and click on the la pavoni machine on the right to access the full parts list. We have all variations of the elements.
in the boiler water is heated and presured up to 1.5 bar
when water gets in lever and non return valve closes becouse you press the lever down, your energy is used to get high pressure, it should be frpm 7 up to 9 bar.
SOLUTION==if you search way for modifying, you must consider that you must pump directly to group, not to boiler. in this case water will be cold (becouse comes from pump). you will need boiler in boiler to heat the water wich comes from pump before it gets to group. this is bit more complicated than you thought may bee but it is only solution.